This has to be the winner for me! I don't think I ever had so much fun with a gamejam game.
And I don't like to brag, but I beat the boss on my second playthrough :p
If I had to give some feedback it would be that I'd like some sort of indication how far along I am until the end boss, and a different music theme for the stages.
Other wise this amazing, especially for a gamejam game!